6505005660 has 48 divisors (see below), whose sum is σ = 18842090400. Its totient is φ = 1674851584.

The previous prime is 6505005653. The next prime is 6505005671. The reversal of 6505005660 is 665005056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1867515 + ... + 1870994.

It is an arithmetic number, because the mean of its divisors is an integer number (392543550).

Almost surely, 2^6505005660 is an apocalyptic number.

6505005660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6505005660 is an abundant number, since it is smaller than the sum of its proper divisors (12337084740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6505005660 is a wasteful number, since it uses less digits than its factorization.

6505005660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3738550 (or 3738548 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 6505005660 is about 80653.6152940462. The cubic root of 6505005660 is about 1866.7345242480.

The spelling of 6505005660 in words is "six billion, five hundred five million, five thousand, six hundred sixty".